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Beacon Rate Field
Transfer Rate Field
DGPS Frequency Field
NMEA Setting Field
REFERENCE
Interface Setup
DGPS
Interface Setup: DGPS (continued)
To enter a DGPS beacon frequency:
1. Highlight the ‘FREQ’ field, and press
ENTER
.
2. Enter the desired frequency, and press
ENTER
.
3. Highlight the ‘RATE’ field, and press
ENTER
.
4. Select the desired bit rate (bps), and press
ENTER
.
Note: The frequency and bit rate fields are disabled
when the ‘RTCM/NONE’ option is selected.
When the GPS 12CX is receiving DGPS corrections
from the GBR 21, the ‘BEACON RECVR’ section of the I/
O setup page will display the beacon frequency and sig-
nal strength, as well as the distance from the beacon
transmitter to your present position. At the bottom of
the beacon receiver field, a status message will keep you
informed of DGPS activity:
• A ‘Tuning’ message will be displayed while a beacon
receiver is selecting a frequency/bit rate and waiting
for signal reception.
• Once a valid beacon signal has been received, a
‘Receiving’ message will be displayed.
• If the beacon signal is received and no correction data
is being received, a ‘No Data’ message will be dis-
played.
• If a beacon frequency cannot be tuned and/or no
signal is received, a ‘No Status’ message will be dis-
played.
The message page will alert you to any problems
relating to DGPS operation. You may also monitor the
DGPS status from the status field on the interface page.
The GPS 12CX will display one of three alert messages
concerning DGPS operation:
No DGPS Position— there is not enough correction
data available to compute a DGPS position.
No RTCM Input— the beacon receiver is not properly
connected, the baud rates do not match or no signal is
being provided.
RTCM Input Failed— DGPS data was being received
but has been lost.